What happens if you never wash a car?

Because dirt acts as a sponge, absorbing moisture from the air and promoting rust, washing your car once a week is recommended to extend the life of the paint and body. Regularly washing a car at a local coin car wash, touchless automatic car wash services, or soft foam car wash can protect it from the corrosive effects of dirt, salt, and pollution. If you wash your car once a week, you can keep it looking like new and increase its resale value.